On Sat, 21 Mar 2009, Ingo Molnar wrote: > > * Anton Vorontsov <avoront...@ru.mvista.com> wrote: > > > On Fri, Mar 20, 2009 at 08:57:43PM +0100, Ingo Molnar wrote: > > > > > > * Anton Vorontsov <avoront...@ru.mvista.com> wrote: > > > > > > > On Fri, Mar 20, 2009 at 08:04:28PM +0100, Ingo Molnar wrote: > > > > > > > > > > * Anton Vorontsov <avoront...@ru.mvista.com> wrote: > > > > > > > > > > > commit 40ada30f9621fbd831ac2437b9a2a399aad34b00 ("tracing: clean > > > > > > up menu"), despite the "clean up" in its purpose, introduced > > > > > > behavioural change for Kconfig symbols: we no longer able to > > > > > > select tracing support on PPC32 (because IRQFLAGS_SUPPORT isn't > > > > > > yet implemented). > > > > > > > > > > Could you please solve this by implementing proper > > > > > irqflag-tracing support? It's been available upstream for almost > > > > > three years. It's needed for lockdep support as well, etc. > > > > > > > > Breaking things via clean up patches is an interesting method of > > > > encouraging something to implement. ;-) > > > > > > > > Surely I'll look into implementing irqflags tracing, but > > > > considering that no one ever needed this for almost three years, > > > > [...] > > > > > > Weird, there's no lockdep support? > > > > *ashamed*: apparently no such support currently exist for PPC32. ;-) > > Hm, do all the tracers even compile on ppc32 with your patch? > > We had periodic build failures on weird, unmaintained architectures > that had no irqflags-tracing support and hence didnt know the > raw_irqs_save/restore primitives ... > > I'm not trying to make things more difficult for you (and we can > apply your patch if it builds fine and does not cause problems > elsewhere), but there were some real downsides to not having proper > irq APIs ...
Note, the issue is not with the hooks into local_irq_save/restore, but with the entry.S code. That code is very sensitive where the irqs are enabled and disabled. -- Steve _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev